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Preheat oven to 400F.
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Coat a 12-hole muffin tin with cooking spray.
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Whisk together the flour, baking powder, and salt in a medium bowl.
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Set aside Separate the egg, placing the whites in a medium bowl and the yolk in a large bowl.
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Set the whites aside.
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Add the brown sugar, applesauce, oil and vanilla to the yolk.
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Mix w/a wooden spoon until well blended.
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Add the flour mixture and stir until well combined.
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With an electric mixer on medium speed, beat the whites until soft peaks form.
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Add whites to the batter along with 4 Tbsp of the chocolate chips.
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Stir until well blended.
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Divide batter equally among the 12 muffin cups.
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Sprinkle 1/2 teaspoon chocolate chips on the top of each muffin.
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Bake until toothpick comes out cleam, about 23 minutes.
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Cool 5 minutes in the tins- then remove muffing to a rack and cool 10 minutes more.